Weird Al's audiences are well-behaved and attentive, within the context of the show. But iPhones abound, and we even had a song to that effect where everyone in the audience would hold up their phones. About 2 years ago, way in the back of the audience at a show in Sydney, I saw an iPad being held up!

The fact that shows were being recorded was initially a concern, but the quality and size renders such recordings useless in terms of commercial value, and poses little threat of lost revenue. If somebody genuinely prefers to watch distorted sounding shaky clips on YouTube, perhaps they're better off staying home anyway.